(Delphi DLL) Base64url Encoding

Base64url encoding is identical to base64 encoding except it uses non-reserved URL characters (e.g. '–' is used instead of '+', and '_' is used instead of '/') and it omits the padding characters.

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat for Delphi Downloads Chilkat non-ActiveX DLL for Delphi Chilkat ActiveX DLL for Delphi * The examples here use the non-ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, PrivateKey, Rsa;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
pkey: HCkPrivateKey;
rsa: HCkRsa;
strData: PWideChar;
strSig: PWideChar;

begin
success := False;

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

pkey := CkPrivateKey_Create();
rsa := CkRsa_Create();
CkRsa_GenKey(rsa,1024,pkey);
CkRsa_UsePrivateKey(rsa,pkey);

strData := 'This is the string to be signed.';

// Get the signature in base64url
CkRsa_putEncodingMode(rsa,'base64url');
strSig := CkRsa__signStringENC(rsa,strData,'sha256');

Memo1.Lines.Add(strSig);

CkPrivateKey_Dispose(pkey);
CkRsa_Dispose(rsa);

end;